August bossaed



(No Model.)

A. BOSSARD.

PROJEOTILE.

No. 361,920. Patented Apr. 26, 1887.

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UNITED STATES PATENT OFFICE.

AUGUST BOSSARD, OF NEW YORK, N. Y.

PROJECTILE.

SPECIFICATION forming part of Letters Patent No. 361,920, dated April 26, 1887.

(No model.)

To all whom it may concern.-

Be it known that 1, AUGUST BOSSARD, a citizen of the United States, residing at New York city, in the county of New York and State of New York, have invented certain new and useful Improvements inProjectiles; and I do hereby declare the following to be a full, clear, and exact description of the invention, reference being had to the accompanying drawings, which form partof this specification.

This invention has relation to projectiles of that class used in rifled ordnance, and more particularly to breech loading ordnance of small caliber.

This invention consists in a projectile grooved on its outer surface, or a portion thereof, in the form of a spiral, said groove being filled with a continuous rod or band of soft metal held in place by being electroplated, galvanized, or tinned.

Referring to the accompanying drawings, Figure 1 is a plan view of my improved projectile. Fig. 2 is a sectional view of the same; and Fig. 8 is a sectional view of a modification in which the groove surrounding the main or body portion of the projectile is in the form of a dovetail.

Ais the projectile,whi ch is herein shown as a shell having the cavity B and cap 0. This projectile A is usually of cast metal, and may have the groove D formed in the process of casting, or the projectile may be cast with its exterior surface plain and thegroove be afterward cut thereon. The rod or band E, which is preferably of soft copper, is attached to the body A by inserting its end in a hole, 1), formed in the bottom of the end of the groove nearest to the point of the projectile and then winding the band around the body A and forcing it into the groove. The band or rod E being of greater diameter than the groove, a portion of its body will remain outside and form a spiral projection or screw on the outside of the projectile. When the groove is formed as shown in Fig.3 of the drawings, sufficient pressure must be used to cause the rod orband to spread Within the groove, so as to be firmly dovetailed therein. After inserting the rod or band E, as above described,I may either electroplate it with reguline copper, galvanize it with zinc, or tin it by the well-known process of tinning, ap-

plying either of these portions to the rod or band E only, or to the entire exterior of the projectile, the electroplating, galvanizing, or tinning serving to more firmly retain the band in position, and also as a protection from rust or corrosion. The rod or band E may be of smaller diameter throughout that portion toward the point of the projectile, so that the projectile will gradually take in the riding during the passage of the projectile through the gun in the act of firing.

While I have shown and described a single spiral surrounding the body A, it will readily be understood that two or more parallel spirals may be used without departing from the spirit of my invention.

It will also be clearly seen that the projectiles and spiral bands may be turned in a lathe or otherwise trued or finished, either before or after the process of electroplating, galvanizing, or tinning.

\Vhile I have described the bands E as being made of soft metal manually inserted in the grooves, Iwish it understood that the same effect can be produced by depositing the soft metal in the grooves and forming the spiral projections by electro deposition of metal by any of the well-known processes, or the metal can be deposited upon the body of the pro jectile without previously grooving the same.

What I claim as my invention is 1. A projectile for rifled guns having a spiral circumferential groove, and a band of soft metal seated in said groove projecting beyond the surface and retained therein by electroplating, galvanizing, or tinning, as set forth.

2. A projectile for rifled guns having a spiral peripheral groove with soft-metal bands seated therein and projecting therefrom and exteriorly coated with soft metal, substantially as shown and described.

3. A projectile for rifled guns, consisting of the iron or steel body A, having spiral groove D, and electro-deposited band E, seated therein and projecting beyond the surface, as shown and described.

In testimony that I claim the foregoing I have hereunto set my hand.

AUGUST BOSSARD.

IVitnes'ses:

WILLARD W. PETTENGILL, P. HAERRY. 

